Ha, I thought mine was bad...
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To be honest, with a graph like yours I`d be on the phone to Bob asking his opinion.
My graph above was done last year and I`ve spent considerable time (and money) trying to rectify problems that may have a bearing on the dip in the torque curve.
I had my carburetors rebuilt, I had a crack in one of the manifolds welded up and both of them skimmed. I had one distributor rebuilt many times all to no avail, then I had another distributor rebuit andrecurved. I tried pertronix, then went back to points, oh and put some new plugs in.
I`m planning to go down to Bobs and see if any of this has had an effect, the car certainly seems to drive better.
So in short your problems maybe with how your distributor is working/advancing. Is there any scarring inside the dizzy cap caused by shaft wobble. Do the weights move easily or are they catching?
Or maybe your engine is sucking in air where it shouldn`t be, you don`t say whether your car has carbs or is injected... If you are on carbs, are the shafts loose and letting air in? Spray the shaft ends with brake cleaner whilst the engine is running... does it get sucked in ? Cracks in the manifolds can happen if the manifolds have been tightened down too much but you`ll have to whip them off and scrutise them closely. When you`ve got them off, lay the mating surfaces on a piece of plate glass to check they`re nor warped... same with the carbs.
One other thing I can think about is how clean is your fuel supply ? Reving the tits off an engine sucks any silty rubbish you might have lurking in your fuel tank straight into you fuel system and a filter can only do so much.
If you`re injected, then maybe someone else can help.
Regards, Mike.
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